NCRESL
Non-Conventional Refrigeration & Energy Storage Lab
NCRESL
Non-Conventional Refrigeration & Energy Storage Lab
My main research focus is on sorption (absorption/adsorption) based Green Refrigeration, Carbon Capture and Energy Storage. These sorption-based systems address both the energy and environmental issues the world is facing today, as these systems are driven by waste heat /solar energy, promoting the use of natural refrigerants (CO2, Methanol, Ethanol), encouraging the safe and effective storage and use of energy carriers/ green fuels like H2 and CH4. We have developed an experimental facility to prepare activated carbon (from various bio-waste or industrial waste), which will be used as an adsorbent for the solid sorption systems. Further adsorbent composites are also prepared from activated carbon, expanded graphite, and MOFs to have better transport and adsorption characteristics. An experimental facility is developed to find the adsorption isotherms and kinetics of gasses like CO2, CH4, and H2 onto different adsorbents for a 1-100 bar pressure range.
Green Refrigeration
Our research mainly includes compression and sorption-based refrigeration systems that employ carbon dioxide and other natural refrigerants as the working fluid. The inclusion of ejector expansion and thermoelectric subcooling in both compression and solid sorption systems is one of the key features of our research output. Compressor-driven adsorption-based cooling systems using CO2 as the refrigerant are also expounded.
CO2 Capture:
Development of adsorbents (Activated Carbon, MOFs, Composites) for post-combustion CO2 capture.
Experimental determination of adsorption isotherms and kinetics of gas mixture (CO2+N2) at sub-atmospheric to atmospheric pressure
Heat and mass transfer studies on adsorbent beds suitable for post-combustion CO2 capture.
Determination of the breakeven curves (experimental & computational)
Adsorbed Natural Gas Storage System:
Thermoelectric Coolers and Generator
Porous Fins (Analytical & Numerical)
Building Heat and Mass Transfer
I would also like to expand my research work in HVAC of buildings, building heat transfer and design of energy-efficient buildings. In India, buildings consume about 32% of the total primary energy, and space conditioning (heating and cooling) accounts for about 45% and 31% of the energy usage in residential and commercial buildings, respectively. Thus, space conditioning in buildings constitutes a large portion of the primary energy consumption. As the global temperatures rise due to climate change, the energy need for space heating is projected to decrease, while space cooling needs will increase. Thus, in India, where space cooling requirements are much larger than heating requirements, climate change can lead to a substantial increase in building energy consumption. In addition to climate change, demand for space conditioning will further increase in India due to growth in population, income, and floor space. Thus, solutions are urgently required to reduce the energy use for space conditioning in India, which will also help decrease greenhouse gas (GHG) emissions from buildings and combat climate change. This research aims to reduce building energy consumption in India by using passive techniques such as incorporating insulation and phase change materials (PCM) in the building envelope (walls and roof) and making effective use of night ventilation. However, the successful implementation of these techniques is dependent on the building construction and the climatic conditions; thus, the solutions need to be tailor-made for the specific construction practices and climate conditions prevalent in India. It is anticipated that judicious implementation of various passive techniques in buildings could significantly reduce energy consumption and help to combat climate change.